Slice the brussels sprouts in half. Add the sprouts to a large bowl and toss with the olive oil, lemon juice, salt and pepper. Turn out onto a baking sheet and place them cut side down.
Roast the sprouts for 20 minutes, then remove from the oven and shake well so they roast evenly. Roast an additional 15-20 minutes, for a total cooking time of 35-40 minutes.
Remove when the sprouts are crispy and have evenly browned.
Sprinkle with parmesan and serve immediately.
Notes
This recipe makes 4 servings, and each serving has 6.1 net carbs.